Antibacterial Effect of Silver-Zeolites in Glass-Ionomer Cements

Abstract:

Article Preview

In this study, the antibacterial effects of glass ionomer cement containing silver-zeolite
were evaluated. New antibacterial glass ionomer cements with silver-zeolite were prepared as
follows. Silver-zeolite (1, 3, and 5 wt%) was incorporated into the glass ionomer cement powder
and then mixed with the polyacidic liquid at the ratio recommended by the manufacturer. Agar
diffusion test was used to evaluation of antibacterial effect. Setting time, film thickness and
compressive strength were also determined. Paired samples t-tests and ANOVA were used, and
P<0.05 was considered significant. Film thickness and setting time were increased dependent on the
amount of silver-zeolite. Glass ionomer cement with 1 wt% of silver-zeolite seemed to increase the
compressive strength. However, increasing ratio of compressive strength was diminished beyond 3
wt%. Glass ionomer cements containing silver-zeolite have been successfully demonstrated to have
antimicrobial effects on S. mutants in vitro. These results indicate that glass ionomer cement
containing silver-zeolite have the potential to enhance antibacterial of dental cement in oral cavity.

Abstract: Four different bioreactive ceramics were prepared using a sol-gel method and a standard melting process. The aim was to study antibacterial effect of these materials on the growth of Staphylococcus epidermidis. The dissolution (Si and Ca ions) of fine (≤ 45 !m) ceramic powders in a tryptone soya broth (TSB) was investigated. Also the pH changes in TSB solution were measured.
In addition the adherence of Enterococcus faecalis (Ef) to materials was investigated. The bacterial adhesion was studied using scanning electron microscopy (SEM). In the bacterial and the adhesion
test, CaPSiO2 and S53P4 had the strongest antimicrobial effect against studied bacteria. It was shown that bioreactive sol-gel derived ceramic with sufficient high Ca ion release (> 270 ppm) can reach strong antibacterial effect also at lower pH values (< 9.6).

Abstract: Vacuum plasma sprayed (VPS) hydroxyapatite (HA) coatings with silver-loaded
zirconium phosphate antimicrobial have been prepared on titanium substrate. Antibacterial effects
of the coatings were studied by bacteria culturing using Porphyromonas gingivalis (Pg),
Fusobacterium nucleatum (Fn) and Actinobacillus actinomycetemcomitans (Aa) as microorganisms.
Simulated body fluid (SBF) test was carried out to evaluate the bioactivity of the coatings as well.
The results obtained showed that the coatings exhibited a marked antibacterial effect against Pg, Fn
and Aa when the content of antimicrobial was equal to or more than 5%. The antibacterial
capability of the coatings decreased in the following order: Pg, Fn, Aa. Bone-like apatite layer was
formed on the silver-containing HA coatings after immersed in SBF, suggesting that their
bioactivities were not affected obviously by the addition of silver-zirconium phosphate
antimicrobial. This study indicated that silver-containing VPS HA coating is a prospective candidate
as dental material.

Abstract: Silk fabrics are highly popular with people for their excellent properties, with science and living standards progress, the natural and no added finishing method is pursuited by people especially, functional textile products become more and more popular. In this paper, silver nanoparticles were deoxygenated by using natural cactus solution. This silver nanaparticles were prepared under the unpolluted environment. The basic raw material is natural selection, preparation method is simple, non-polluting, eco-friendly and to address the reliability of a better way. Natural fabrics treated with natural plant, not only improve the added value of the product, but also achieve natural of the fabric, meet the requirements of the modern people. This research product the cactus silver nanoparticles silk fabric, demonstrated that the cactus solution can fix the nano-silver uniform on the surface of the silk fabric. Studied the antibacterial property of the silk fabric after finishing, discussed the fabric breaking strength and antibacterial property of silk fabric under different concentration、temperature and time. Finally, the best finishing process obtained is: 0.01mol/L silver ammonia is 2mL, the extract from cactus is 50mL, liquor ratio is 1:50, dipping temperature is 60°C, dipping time is 60min.

Abstract: We prepared silver-containing hydroxyapatite (Ag-HAp) powders by an ultrasonic spray-pyrolysis (USSP) technique and evaluated their antibacterial activity. Ag-HAp powders with Ag contents of 0, 1, 2, 5, and 20 mol% as nominal composition were prepared by the above USSP technique. The droplets of starting solutions were dried at 300 °C and then pyrolyzed at 850 °C to prepare the Ag-HAp powders. Ag-HAp powders showed a HAp single phase and were composed of spherical particles with a diameter of 0.5 - 3.0 μm. To evaluate the antibacterial activity of resulting powders, colony count method was performed using Staphylococcus aureus. Ag-HAp powders with the contents of Ag more than 5 mol% showed good antibacterial activity.

Abstract: The purpose of the study was to identify the influence of the amount of fluoride release from glass ionomer cements on survival of bacterial strains responsible for the development of secondary caries. All developed cements had an antibacterial impact on the strains used in the study. The study demonstrated that the cements exhibit greater antibacterial activity against Streptococcus mutans than Streptococcus sanguinis. The numbers of bacteria count in cultures on the developed cements were approximately 10 times lower compared to the control culture after 24 h, 48 h, 72 h and 7 days. The developed cements had initially (1-2 days) greater antibacterial impact against the strains used in the study, which corresponds to the greatest daily amount of fluoride released from the cements. Following the initial period, the antibacterial activity of all the cements remained roughly at the same level.